AEE vs CMS: Which Is the Better Buy in 2026?
Last updated October 2026
Short answer
AEE is the larger of the two ($29.98B market cap): the incumbent the market prices for continued execution (18.66x forward earnings, beta 0.45). CMS is the smaller challenger ($21.22B), priced similarly on forward earnings (16.54x): more room to run, but more to prove. The real question is which set of drivers you believe, and whether owning one (or both) leaves you over-concentrated.
AEE vs CMS: the tie-breaker metrics
Same yardstick, side by side (as of October 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.
| Metric | AEE | CMS | What it tells you |
|---|---|---|---|
| Market cap | $29.98B | $21.22B | Size. The larger name is the incumbent; the smaller has more room to grow and more to prove. |
| Forward P/E | 18.66 | 16.54 | Valuation on next year's expected earnings, the same yardstick for both. Lower is cheaper for that growth; higher means the market is paying up. |
| Trailing P/E | 19.06 | 20.63 | Valuation on the last 12 months. A big drop from trailing to forward means the market expects earnings to jump, so more growth is already in the price. |
| Beta | 0.45 | 0.31 | Volatility vs the market. Above 1 swings harder than the index; below 1 is steadier. Higher beta means bigger drawdowns to hold through. |
| Price vs 52-week range | 54% of range | 35% of range | Where today's price sits between the 52-week low and high. Near the high is momentum with less margin of safety; near the low is out of favor or a discount, depending on why. |
| Price / book | 2.19 | 2.26 | How much you pay over book value. Very high can signal an asset-light, high-return business or a rich price. |
Before you buy: how AEE and CMS affect your concentration
The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. AEE and CMS share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.
This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined AEE and CMS exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.
What does Ameren Corporation (AEE) do?
Ameren Corporation is a St. Louis based utility holding company that delivers electricity and natural gas to roughly 2.5 million electric and 900,000 gas customers across a 64,000 square mile footprint in Missouri and Illinois. It reports four segments. Ameren Missouri is a vertically integrated utility that owns generation (including the Callaway nuclear plant, coal units at Labadie, and a growing fleet of gas, solar and storage) and sells power under rates set by the Missouri Public Service Commission. Ameren Illinois Electric Distribution and Ameren Illinois Natural Gas are wires and pipes businesses regulated by the Illinois Commerce Commission. Ameren Transmission owns high-voltage lines inside the MISO grid under federally regulated (FERC) formula rates. Because almost all earnings come from allowed returns on invested capital, the company grows by investing in its rate base and getting that spending into customer rates.
What does CMS Energy Corporation (CMS) do?
CMS Energy Corporation is a holding company headquartered in Jackson, Michigan, whose principal business is Consumers Energy, one of the largest regulated combination utilities in the country, delivering electricity and natural gas to roughly 6.7 million of Michigan's 10 million residents. The company also runs a smaller non-utility enterprise segment (NorthStar Clean Energy) involved in independent power and renewable projects. Because the vast majority of earnings come from rate-regulated operations, CMS Energy's profit is driven largely by the rate base it invests in and the returns approved by the Michigan Public Service Commission.
AEE vs CMS: how do they differ?
Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.
- AEE drivers: Data center load in Missouri; A larger capital plan and rate base growth.
- CMS drivers: Rate-base and capital plan growth; Clean energy transformation.
Which fits which kind of investor
A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: Regulation is the core risk. For CMS, as a capital-intensive regulated utility, CMS Energy carries substantial debt (about $19.3 billion against roughly $241 million of cash in mid-2026, with negative free cash flow as capital spending outruns operating cash flow) and is sensitive to interest rates, which raise financing costs and can weigh on the share price and valuation.
AEE or CMS: which should you pick?
Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick AEE if you believe its drivers more; CMS if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the AEE and CMS guides.
AEE vs CMS: the full fundamentals
AEE. Figures use the ~$108.15 share price on October 27, 2026. Trailing GAAP earnings include tax benefits recorded in 2025; on an adjusted basis trailing EPS is closer to ~$5.36, which puts the multiple near 20x. That is a premium to the broad regulated utility group, reflecting Ameren's above-average rate base growth target. The shares trade at ~2.2x book value. The quarterly dividend is $0.75 after a 5.6% raise in February 2026, with a stated payout target of 50% to 60% of earnings. Analysts' mean target was ~$115 in mid-October, with 13 buy and 9 hold ratings.
CMS. At about $68.32 on October 16, 2026, CMS Energy trades near 20.5x trailing GAAP earnings and about 16.5x forward estimates, a lower multiple than in mid-2026 after the shares slipped about 3% for the year. Second-quarter 2026 adjusted EPS of $0.37 edged past the $0.36 consensus, and third-quarter results on October 27 face a $1.23 estimate. The 12 covering analysts carry a mean target near $76; valuation and yield tend to move with interest rates, so the stock often behaves more like a bond-proxy than a cyclical name.
Headline figures (approximate, October 2026): AEE shows revenue (ttm) ~$8.7 billion, net income (ttm, gaap) ~$1.56 billion, eps (ttm, gaap) ~$5.68, p/e (ttm / 2026 guidance midpoint) ~19x / ~20x; CMS shows market cap ~$21 billion, revenue (ttm) ~$8.8 billion, net income (ttm) ~$1.0 billion, 2026 adjusted eps guidance ~$3.83 to $3.90 (consensus ~$3.87).
The bottom line: AEE vs CMS
AEE and CMS are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined AEE and CMS exposure against your real portfolio. It is not an investment adviser.
Wondering how AEE or CMS fits the portfolio you already own? Walnut is an AI investing app that connects your brokerage read-only and answers questions like that about your actual holdings: overlap, concentration, and how each position tracks the S&P 500. Compare the best AI portfolio analyzers or see the best AI investing apps in 2026.
Investing in Ameren Corporation with AI
Connect the broker you already use and ask Walnut's AI how AEE fits what you actually hold: whether you own it already through a fund, what it would do to your concentration, and how it has tracked the S&P 500. Read-only by default, and you approve anything before it reaches your broker.
FAQ
What is the difference between AEE and CMS?
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Ameren Corporation is a St. CMS Energy Corporation is a holding company headquartered in Jackson, Michigan, whose principal business is Consumers Energy, one of the largest regulated combination utilities in the country, delivering electricity and natural gas to roughly 6.7 million of Michigan's 10 million residents. They show up together because they share investment themes, but they are different businesses, so the better fit depends on which thesis you are expressing.
Is AEE or CMS the better stock?
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Neither is universally better. AEE is the larger incumbent; CMS is the smaller challenger and looks cheaper on forward earnings. Walnut is informational, not investment advice. Compare what each does, the tie-breaker metrics above, and the risks, then decide which fits your thesis and what you already own.
Which is cheaper, AEE or CMS?
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On forward P/E (as of October 2026), AEE trades at 18.66x and CMS at 16.54x, so CMS is the cheaper of the two on next year's expected earnings. A lower multiple is not automatically the better buy: a richer valuation can be justified by faster growth, and a lower one can reflect real risk. Weigh the multiple against how fast each business is compounding.
Should you own both AEE and CMS?
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Because they share themes, owning both concentrates you in that theme. That can be intentional (a focused bet) or accidental (less diversification than it looks). Walnut can show your combined exposure across both, and whether adding either over-concentrates you, before you buy.
What are the risks of AEE vs CMS?
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AEE: Regulation is the core risk. Ameren Missouri's June 2026 request for a ~$343 million annual electric increase (10.25% requested return on equity, 52% equity ratio, $16.7 billion rate base) would add ~$13 a month to a typical residential bill, it is the third request in five years after a ~12% increase in June 2025, and a state lawmaker has asked regulators to examine whether data centers are pushing costs onto households. A decision is due by May 2027, and a lower allowed return or disallowed costs would weigh on earnings. Illinois has historically granted below-average returns and has disputed Ameren rate orders through appeals. Data center demand could arrive later or smaller than signed agreements suggest, while the capital plan proceeds regardless. Financing is heavy: roughly $4 billion of planned equity issuance dilutes shareholders, and higher interest rates raise borrowing costs and make the ~2.8% yield less competitive with bonds. Weather swings quarterly results, the gas-heavy resource plan and delayed coal retirements carry environmental and policy risk, and at ~20x 2026 guidance the shares are priced for growth delivery. CMS: As a capital-intensive regulated utility, CMS Energy carries substantial debt (about $19.3 billion against roughly $241 million of cash in mid-2026, with negative free cash flow as capital spending outruns operating cash flow) and is sensitive to interest rates, which raise financing costs and can weigh on the share price and valuation. Earnings depend heavily on constructive decisions from the Michigan Public Service Commission on rate cases and allowed returns, and unfavorable outcomes could pressure results. Execution on the large clean-energy capital plan carries cost, permitting, and supply-chain risk, and severe weather events can drive storm restoration costs and reliability scrutiny. Concentration in a single state means Michigan's economy, regulation, and weather have an outsized effect, and slower-than-expected large-load growth would reduce a key upside driver. The run of price-target cuts in the autumn of 2026 shows how quickly sentiment toward a premium-valued utility can cool even when quarterly results land on target.
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Walnut is informational, not investment advice. This page is descriptive and not a recommendation to buy or sell AEE or CMS; figures are approximate and dated (as of October 2026). Verify current data before investing.